docs: add Quick Start example and update example timestamps in README

[QuenumGerald]

Motivation

• Provide an immediate "Quick start" snippet to help users bootstrap the scheduler with sqlite storage and basic usage.
• Refresh example timestamps in the CLI and API examples to be current and reduce confusion from outdated dates.

Description

• Add a new Quick start section with a minimal TypeScript example showing BlazeJob initialization, schedule, and start using storage: 'sqlite', dbPath, and concurrency options.
• Update the npx ts-node src/bin/cli.ts schedule example timestamp to 2026-01-01T00:00:00Z and the curl runAt payload timestamp to 2026-01-01T00:00:00Z.
• No application logic or tests were changed; this is documentation-only edits in README.md.

Testing

• No automated tests were required or run because this change only updates documentation files.

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[chatgpt-codex-connector]

Remove top-level await from quick-start snippet

Using await jobs.start() at top level will fail for users following the repository’s default TypeScript/CommonJS setup, because top-level await is only allowed in ESM-compatible module configurations. A copy-paste of this “Quick start” example can therefore produce an immediate compile/runtime error instead of a working starter, while jobs.start() (without await) already matches the other README examples.

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